Different pin-assign between each half of split-type

## Actual

- Different keymap.rb should be put in the other half

## Expected for example

```ruby
kbd.split = true

if kbd.anchor?
  kbd.init_pins(
    [ 4, 5, 6, 7 ],
    [ 29, 28, 27, 26, 22, 20 ]
  )
else
  kbd.init_pins(
    [ 29, 28, 27, 26 ],
    [ 9, 8, 7, 6, 5, 4 ]
  )
end
```